lightroom4 : adding black and white eyedroppers to curve tool

can adobe add three eyedroppers to curve tool in Lightroom4 : black, white and grey points like photoshop and nx2 ? this is different than alt+slider exposure and black, it shifts colors and it is very fast method.
i aw aware lightroom users want to use the full tonal range but this is a very standard tool we can choose to use or not
best regards